78,000 rounded to the nearest ten thousand is 80,000.
Answer:
a = 1.5
b = 1.75
Step-by-step explanation:
First, we need to solve
and replace the result in the initial equation as:

Then, this equality apply only if the coefficient of
is equal in both sides and the constant is equal in both sides.
It means that we have two equations:

So, using the first equation and solving for a, we get:

Finally, replacing the value of a in the second equation and solving for b, we get:

Answer:
3. How many faces do each of the following have?
- cube - 6 faces
- square pyramid - 5 faces
- triangular pyramid - 4 faces
- pentagonal pyramid - 6 faces
Hope this helps!